Grundfos AQtap Service Instructions With Installation And Operating Instructions page 23

English (GB) Service instructions
CONTENTS
15. Fault finding
15.1 Installation faults
15.2 Invalid SIM card
15.3 Insufficient power supply
15.4 Fault finding
15.5 Mobile connection faults
15.6 User interface faults
16. Cleaning the solenoid valve
17. Replacement of spare parts
17.1 Safety instructions and requirements
17.2 Replacing the strainer (strainer kit)
17.3 Preparing the AQtap cabinet for internal servicing
17.4 Replacing the battery (battery kit)
17.5 Replacing the flow sensor (flow sensor kit)
17.6 Replacing the solenoid valve (valve kit, complete)
17.7 Replacing the hydraulic part (hydraulic kit)
17.8 Replacing the control unit (control unit kit)
17.9 Replacing the power supply unit (power supply kit)
17.10 Replacing the antenna (antenna kit)
17.11 Replacing the cables (cable kit)
17.12 Replacing the power plug (power plug kit)
17.13 Replacing the flow restrictor (flow restrictor kit)
17.14 Completing steps after internal servicing
Prior to servicing, read these service instructions.
Caution
Servicing must comply with local regulations and
accepted codes of good practice.
These service instructions are also available on
Note
www.grundfos.com.
15. Fault finding
If the AQtap does not operate properly:
1. Carry out maintenance, see section 10.1 Maintaining the
product.
2. Clean the solenoid valve, see section 16. Cleaning the
solenoid valve.
3. Check for displayed warning or alarm codes by means of the
service menu / ServiceCard.
4. Restart the AQtap.
- If the AQtap still does not operate properly, check
installation, SIM card and solar power to avoid typical faults,
see section 15.1 Installation faults.
If defective parts are detected, replace them by means of the
applicable service kit, see section 17. Replacement of spare parts
15.1 Installation faults
Page
Fault Cause
23
• tank installation
23
23
23
• piping too long
24
25
Water pressure • dirt or deposits in
25
below 0.2 bar
26
• strainer clogged
27
27
27
29
30
• too much
32
Water pressure
33
above 4 bar
35
37
40
• water contains
Water particles
43
clog the
43
strainer
44
45
• insufficient solar
AQtap runs on
47
internal battery
too often
15.2 Invalid SIM card
If the SIM card is invalid or missing, the AQtap can't reconnect to
the Water Management System (WMS). Warning code 159 is
displayed.
Make sure that the recommended type of SIM card is used and
installed correctly, see section 4.7 SIM card preparation and
installation.
If a top-up (prepaid) SIM card is used, make sure that credits are
available on the card and that it fulfils all requirements.
15.3 Insufficient power supply
The internal battery is loaded when grid or solar power is
available, and is used as a backup power for approximately 12
hours of operation, assuming 250 tappings of 20 l at a flow rate of
25 l/min and idle time between the tappings.
After discharging the backup battery, tapping water will not be
possible right away when power supply is on again, until the
battery is recharged. A discharged battery takes 12-14 hours of
constant grid supply to be recharged. If water is tapped while
recharging, it may take longer. If the internal battery is not
powerful enough, it can be substituted by an external battery.
• When power supply is back again, recharging of the battery
starts and code 040 is displayed. It takes approximately 15
minutes with code 040 continuously displayed, until the battery
is recharged over a certain voltage. The AQtap restarts
automatically and is operable again.
• If this happens more often with insufficient solar power, an
external battery with MPPT solar charger can be used.
15.3.1 Battery life management
The internal battery is a wear part. If the external
power supply is insufficient or instable, the battery is
often completely discharged and used in a low state
Note
of charge. As a consequence the battery can be worn
out within a few weeks.
Depending on the solar radiation and degree of
AQtap utilization the internal battery and charging
with solar power can be insufficient.
Note
In cases where tapping is not possible after using the
backup battery, an external battery with MPPT solar
charger can be used.
Remedy
- install tank at a higher
lower than 3 m at position
the outlet
- shorter distance
between tank and
and with bends AQtap, avoid bends
- remove flow restrictor
the pipes (only allowed when
pressure is ensured to
be always < 0.5 bar)
- clean the pipes and
the fittings
- clean strainer
- install a pressure
pressure from reducing valve
water grid
- install an elevated
break tank in front of
the AQtap
- clean the strainer
particles bigger more frequently
than 0.5 mm
- clean the tank from
sediment
- use external battery
power with MPPT solar
charger, see section
15.2 Invalid SIM card
23